[ Versions 14 and 15 ] Adjust Layout | Liquid Page Rule "Scale" is affecting the result
as it seems feature Adjust Layout is actually affected by Liquid Page Rule.
Two identical pages will scale type differently if Liquid Page Rule is set to "Based on Master" on one page and "Scale" on the other page.
This seems to be a bug. Liquid Page Rule should not affect the result of Adjust Layout. Applied my test documents from my German InDesign 2020 18.104.22.1680 on Windows 10:
NOTE: I renamed the zip file to .zip.txt because this site will NOT allow to attach zip files.
Also see into this thread at Adobe InDesign Forum where the issue came up recently:
Unusual, weird layout (ID CC2020): fonts are scaled
Feb 05, 2020
( ACP )
Yes, It is a big bug